Weekly topic: 5 Wealth points for correct answers, 2 Wealth points for participation； Question 143
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Multiple choice: PVC is the abbreviation for polyvinyl chloride. To ensure the performance of PVC plastic products, various organic additives are usually added. Which of the following facts can support the hypothesis that PVC plastic wrap is harmful to human health? ( ) ① PVC plastic is a type of polymer material. ② The organic additives used in it are toxic. ③ Compounds containing chlorine are not necessarily toxic. ④ It decomposes to release harmful substances at high temperatures. A. ①② B. ③④ C. ②④ D. ①③ Answer: C Explanation: Polyvinyl chloride is a polymer compound that is widely used in daily life. However, it decomposes to release harmful substances such as HCl at high temperatures or due to exposure to light. Additionally, the plasticizers (organic additives) contained within it are toxic; therefore, PVC products should not be used to store food or come into direct contact with food. Thus, ② and ④ are the correct options.
PVC is the abbreviation for polyvinyl chloride; to ensure the performance of PVC plastic products, various organic additives are usually added. The facts among the following options that can all support the hypothesis that \"PVC plastic wrap is harmful to human health\" are (C): ① PVC plastic is a type of polymer material; ② The organic additives used are toxic; ③ Compounds containing chlorine are not necessarily toxic; ④ It decomposes to release harmful substances at high temperatures. A. ①② B. ③④ C. ②④ D①③
PVC is the abbreviation for polyvinyl chloride; to ensure the performance of PVC plastic products, various organic additives are usually added. The facts among the following options that can all support the hypothesis that \"PVC plastic wrap poses a risk to human health\" are (C)
The assumption is (B. ③④)
Multiple choice: PVC is the abbreviation for polyvinyl chloride. To ensure the performance of PVC plastic products, various organic additives are usually added. The facts among the following options that can all support the hypothesis that \"PVC plastic wrap is harmful to human health\" are (B) ① PVC plastic is a type of polymer material; ② The organic additives used in it are toxic; ③ Compounds containing chlorine are not necessarily toxic; ④ It decomposes to release harmful substances at high temperatures. A. ①② B. ③④ C. ②④ D①③
The facts among the following options that can all support the hypothesis that \"PVC plastic wrap is harmful to human health\" are c
Answer: C. ②④. ② The organic additives used are toxic; ④ It decomposes to release harmful substances at high temperatures
PVC is the abbreviation for polyvinyl chloride; to ensure the performance of PVC plastic products, various organic additives are usually added. The facts among the following options that can all support the hypothesis that \"PVC plastic wrap poses a risk to human health\" are (C)
The answer to this question is C. ②④: D:D:D